Perhaps you should try some spelling variations:
"procesos medianas estadisticas datos." » "procesos medidas estadisticas datos.", "procesos espana estadistica datos.", "procesos mexico estadisticas datos.", "procesos medianas estadistica casos.", "procesos medianas estadisticas metodos.", "procesos medianas estadisticas de.", "procesos mediante estadisticas datos.", "procesados mediante estadisticas datos.", "procesos mediaticos estadisticas datos."
"process control statistics methods." » "process control statistical methods.", "process control estadistico methods.", "process control estadistica methods.", "process control statistics methodology.", "proceso control statistics methods.", "procesal control statistics methods."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistics methods.") OR ("procesos medianas estadisticas datos."))~.
• Removing quotes may allow a broader search: (( process control statistics methods. ) or ( procesos medianas estadisticas datos. ))~.
• Adding a wildcard symbol may retrieve word variants: (("process control statistics methods.") or ("procesos medianas estadisticas datos."))*.